Mapstruct如何从源对象的2个或更多字段构造目标对象？

Question

class PersonDTO {  String name;  String street;  String city;}class Person {  String name;  Address address;}class Address {  String street;  String city;}@Mapper(componentModel = "spring")interface Mapper {  Person fromPersonDTO(PersonDTO dto);}我尝试使用 2String来Address但它抛出不明确的属性异常.我应该在映射器中添加什么到 mapstreet和cityof PersonDTOto Address？更新：@Mapper(componentModel = "spring")interface Mapper {  @Mapping(source = "street", target = "address.street")  @Mapping(source = "city", target = "address.city")  Person fromPersonDTO(PersonDTO dto);}上面的映射器可以处理直接映射。但是如果我想在创建Address对象时添加一些业务逻辑，例如：address.street = street.replaceAll(" ", "_"); address.city = cityDao.findByName(city).getId();有没有办法达到这样的要求？

Answer 1

@Mapper(componentModel = "spring")

interface Mapper {

    @Mappings({

            @Mapping(source = "street", target = "address.street"),

            @Mapping(source = "city", target = "address.city")

    })

    Person fromPersonDTO(PersonDTO dto);

}

属性name应该自动映射，只要它具有相同的名称和嵌套级别

更新：

@Mapper(componentModel = "spring")

public abstract class Mapper {

    @Autowired

    private CityDAO cityDao;

    @Mappings({

            @Mapping(source = "street", target = "address.street"),

            @Mapping(source = "city", target = "address.city")

    })

    Person fromPersonDTO(PersonDTO dto);

    @AfterMapping

    void after(@MappingTarget Person person) {

        Address address = person.getAddress();

        if (address != null) {

            // additional null-checks might be required

            address.setStreet(address.getStreet().replaceAll(" ", "_")); 

            address.setCity(cityDao.findByName(address.getCity()).getId();

        }

    }

}

请注意，为了使用自动装配的 bean，映射器必须是一个类，而不是一个接口